Speed-governing apparatus for electric motors.



No. 777,489. PATENTED DEC. 13, 1904. H, A. BOND.

SPEED GOVERNING APPARATUS FOR ELECTRIC MOTORS.

APPLICATION FILED OCT. 21, 1903 -N0 MODEL.

l llll Zia c1475? UNITED STATES Patented December 13, 1904.

PATENT OFFICE.

HIRAM A. BOND, OF SPRINGFIELD, MASSACHUSETTS.

SPECIFICATION forming part of Letters Patent No. 777,489, dated December 13, 1904. Application filed October 21, 1903. Serial No. 177,850. (No model.)

To aZZ whom, it may concern:

Be it known that I, HIRAM A. BOND, a citizen of the United States of America, and a resident of Springfield, in the county of Hampden and State of Massachusetts, have invented certain new and useful Improvements in Speed-GoverningApparatus for Electric Motors, of which the following is a full, clear, and exact description.

This invention relates to an automatic regu lating or controlling mechanism for an electric motor having for its object to provide an organization in which the running electric motor actuates a mechanical, centrifugal, or equivalent governor, which in turn is operatively connected with the rheostatic or other controller for the current which is interposed and electrically connected in the current-feed wire for the motor between the source of electrical supply and such motor.

The invention comprises in the organization of the apparatus constituting this invention the combination, with an electric motor and circuit connections therefor, of a controller of the rheostatic or other equivalent character connected in the circuit-conductor and having, as usual, a succession of contacts corresponding to variable resistances in the controller, a governor in connection with and driven by the motor, and a part automatically actuated by the governor and movable for bearing upon any of the said contacts as regulated by the governor.

The invention furthermore comprises specific arrangements and details of construction for practicability and convenient utilization of the apparatus, as will hereinafter be rendered manifest.

In the accompanying drawings, Figure 1 is a side elevation of the self-governing motor. Fig. 2 is a perspective view of a part of the controller-lever and a part of the governor-actu ated connecting member adapted for detachable and adjustable connection With said lever. Fig. 3 is a plan view of parts in detail as seen below the plane indicated by line 3 3, Fig. 1.

Similar characters of reference indicate cor responding parts in all of the views.

In the drawings, A represents an electric motor of ordinary kind, for which B is the rheostatic controller, the same having, as usual, the binding-posts a and Z), the series of contacts g g, and the therewith connected usual resistances g a contact at one end of the series being electrically connected with the binding-post a, while the other bindingpost, I), is electrically connected with the controller-lever D, which is arranged for swinging movement from the axis f on the controller and arranged to bear successively as such lever is swung on the different contacts 9, arranged in the arc-line, as shown, so that the usual effect of varying the resistance of the current through the rheostat and thence through the connections to the electric motor will be accomplished according as to whether the controller-lever is the nearer the one or the other end of the line of contacts. From the generator the electric wire 0 runs to connection with the binding-post a, and the wire (Z has connection with the other binding-post, b, of the rheostat and runs therefrom to connection with one of the brushes of the electric motor. The other brush of the electric motor has the wire a connected therewith, which is tapped into the wire 6 which has connection with the generator and with the fieldmagnet of the electric motor, and the wire 0 also has electrical connection with the fieldmagnet of the motor and with the generator.

Gr indicates a mechanical governor of the most common type, having the weighted revoluble and centrifugal arms /b it, linked to a sleeve revoluble with and vertically movable relatively to the governor-shaft Z7, said sleeve having thereon to move vertically therewith, but to be non-rotatable relatively thereto, a sleeve m, having a stud 92 or oppositely-projecting studs.

The governor-shaft has a bevel gear-wheel 0 thereon, in mesh with which is a smaller bevel gear-wheel p, affixed on the motor-shaft q, whereby the governor is speeded with corresponding velocity to the velocity of the motor.

The governor-stand 9' is shown as provided with two horizontally-extended bracket-arms s and t, and pivoted to the upturned extremity of the bracket s is a lever it, having its free extremity preferably bifurcated, slotted, as indicated at o, the slot boundaries engaging the aforementioned stud a or duplication thereof.

A rack-bar w is byits upper end adjustably connected in any of the holes 10 along the length of the lever 91, the lower rack-toothed end of said bar being in mesh with a spur pinion-wheel on a short shaft {11 horizontally journaled through the aforementioned bracket 6, while the edge of the bar opposite its rack-teeth has a rolling bearing against and is kept in mesh with the said pinion by the roller-stud g, which is sustained on said bracket t.

Connected on the arbor or short stud for the pinion (0 is a small gear-wheel .2, which is in mesh with they rack-toothed extremity 20 of a connecting-bar J, said bar having an en gagement which preferably is both detachable and adjustable with the controller-lever D.

As shown, the controller-lever has the longitudinal slot 22 therein and is provided at its extremity with the handle 23.

The stud 24, having the shoulder 25 at one part and the confining-nut 26 at its threaded extremity, is, as plain, adapted to be set and confined anywhere within a given range along the length of the controller-lever, and said stud constitutes by its outwardly-projecting portion an element in connection with which the apertured portion 28 of the connectingbar may be brought, said connecting-bar having at its end adjacent the controller-lever the handle 30.

The rack-toothed extremity of the connecting-bar J has its lower edge opposite from the upwardly-extending rack-teeth in riding contact on the roller 32, supported next thereunder by the depending member 33 of the bracket t.

The action of the governor-arms, depending upon the speed of the electric motor, will impart a raising and lowering vibratory movement to the lever u and through the described connections a swinging movement of the controller-lever for automatically varying the resistance of the current fed to the motor, whereby a perfectly even running of the motor may be insured irrespective of mutations in the generator at the power plant or intermittent workings of other electric motors in electrical connection with the same feed-wire as supplies this governor-regulated motor.

By changing the connection of the rack-bar w in any of the holes 10 of the lever u the controller-lever connections may be rendered more or less sensitively effective on the controller, as may in further degree be accomplished by elevating or lowering the stud 24.

By grasping the handle 30 of the connecting-bar J such bar may be lifted out of connection with the controller-lever, and the controller-lever may be set by hand in relation to any of the controller-contacts g, as is advantageously done at the time of starting the motor, it being understood that after the motor is well running the connecting-bar J is replaced in its engagement with the controllerlever for thenceforth insuring the automatic controlling of the motor.

Having thus described my invention, what I claim, and desire to secure by Letters Patent, is

1. The combination with an electric motor and a controller therefor having a movable controller-governing member, of a mechanical governor connected with, and driven by, the motor, and having a movable member, a lever engaged by said movable member, a rack-bar connected with the lever, a gear-wheel with which the rack-bar meshes, a second gearwheel rotatable in unison with the first gearwheel, and a bar having a rack-toothed portion in mesh with said second gear-wheel, and having a connection with the movable controller-governing member.

2. The combination with an electric motor and a controller therefor having a movable controller-governing member, of a mechanical governor connected with and driven by the motor, and having a movable member and hav ing a governor-stand provided with the brackets s and 25, a lever pivoted to the bracket .v and engaged with the movable governor member, a rack-bar connected with the lever, a gearwheel having an arbor mounted on the bracket 6 with which gear-wheel the rack-bar meshes, a second gear-wheel on said arbor, a bar having a rack-toothed portion in mesh with said second gear-wheel and having a connection with the movable controller-governing member, and the rolls 3/ and 32, sustained by the bracket 2? and having bearings against the aforesaid racktoothed parts, constraining them in their gear-wheel meshings and imparting freedom in their longitudinal reciprocatory movement.

3. The combination with an electric motor and a controller therefor having a movable controller-governing member, of a mechanical governor connected with, and adapted to be driven by the motor, and having a movable member, a lever engaged by said movable member. a rack-bar adjustably connected with the lever, at any desired point along the length thereof, a gear-wheel, engaged by the rackbar and the medium of driving connection between said gear-wheel and the controller-governing member.

4. The combination with an electric motor and a controller therefor having a movable governing member, of a mechanical governor connected with, and driven by, the motor, having a movable member, a medium of connection between the movable member of the governor and the movable controller-governing member having a readily-detachable engagement with the latter member.

5. The combination with an electric motor and a controller therefor having a movable governing member, of a mechanical governor connected with, and driven by, the motor, a medium of connection between the movable governor member and the movable oontrollergoverning member which is both adjustably and also conveniently detachably connected With the governor-controlling member.

6. The combination with an electric motor and a controller therefor having a movable controller-governing lever, provided with a slot, and a stud 24, adjustably confined along the length of the said lever, of a mechanical governor connected With, and driven by, the motor, and having a movable member, a pivoted lever engaged with the movable governor member, a rack-bar connected with the lever,

HIRAM A. BOND.

Witnesses:

A. V. LEAHY, WM. S. BELLOWS. 

